Cotton-gin rib



(No Model.)

I. T. WASHBURN.

COTTON GIN RIB.

Patented Feb 17,1891.

IJVVEJVTOR IVITWESASEAS 'lsaffiliw 51/772.

NITED STATES PATENT OF ICE.

ISAAC T. XVASHBURN, OF SING SING, NINV YORK.

COTTON-GIN RIB.

$PECIFIGATION forming part of Letters Patent No. 446,724, dated February17, 1891.

Application filed May 10, 1890. Serial No. 351,318- (No model.)

To all whom it may concern.-

Be it known that I, ISAAC T. WASHBURN, a citizen of the United StatesofAmerica, residing at Sing Sing, in the county of Vestchester and Stateof New York, have invented a new and useful Cotton-Gin Rib, of which thefollowing is a specification.

My invention has relation to improvements in cotton-gin ribs applicableto saw-gins; and the object is to provide a rib for such machines whichwill accomplish the separation of the seeds from the fiber withcertainty and speed without damage to the materials while passingthrough the saws and ribs; and my invention consists in the novelconstruction of the gin-rib, whereby the purposes intended arecompletely attained.

In the accompanying drawings I have fully and clearly illustrated myinvention.

Figure 1 is a vertical sectional View of the hopper, saws, picker-wheel,and adjacent elements of a saw eotton'gin, my improved ginrib beingshown as applied thereto. Fig. 2 is a perspective view of the ribdetached. Fig. 3 is a top plan view of the rib. Fig. 4 is a bottom viewthereof. Fig. 5 is a cross-section on the line .10 av of Fig. 3.

A designates the hopper of the cottongin; B, the saws, and O thepicker-wheel. These parts may be of any of the approved eonstructions,and since my improved rib can be operatively applied to any cotton-ginof sub stantially the construction shown it is not deemed pertinent to aproper understanding of the combined mechanism to give further or morespecific description of these parts. In the hopper'is a support 1,hinged to the frame of the gin, as at 2, and to which support the upperends of the ribs are secured by screws, and below the saws is arrangedand secured a cross-piece 3, on which the lower ends of the ribs restand to which they are secured, substantially as shown in Fig. 1 of thedrawings. The ribs are adjusted in their relation to the saws by adjListing-screws 4; in the cross-piece 5, whereby the breast of ribs mayberaised and lowered and set to do work for coarse or fine grades ofcotton.

These means for attaching and adjusting the ribs are no part of myinvention, and may be altered orreplaced to suit different constructionsof saw-gins.

D designates my improved cotton-gin rib. This consists of cast metalformed in a single piece having a stem or main rib with formed ends tosecure it to the supporting-pieces of the breast. The main rib D is ofthe shape shown in the drawings, with the shaped ends 7 and 8 to fastenit to the supports. The rib on its upper face 9 is made entirely plainthroughout its operative length, and has the sides 10 ll vertical and atright angles to the top face. At substantially the middle of the lengthof the rib is formed a broad flange 12, which is of the usual exteriorcontouror shape given to rilrfianges heretofore made on ribs, myimprovement being that the flange is made of the same thickness as thestem of the rib throughout and is without side or end flanges. It willbe perceived that the construction of the rib is rectangular in its topand side faces, and may be so in practice; but to save metal and givestrength in the depth of the rib I form on the bottom of the rib acentral flange 13.

Actual use of these ribs in a cotton-gin has demonstrated theirsuperiority over any other construction known to me, the work beingaccomplished in a better manner, increased capacity, and improvement insample of fiber.

Having thus described my invention, what I claim is A cOttOn-gini'ibhaving the entire upper face of the stem plain and the sides smooth andat right angles to the top face of the stem, and a broad flange 12 ofthe same thickness throughout as the body of the rib, substantially asdescribed.

In witness whereof I have hereunto set my hand in the presence of twoattesting witnesses.

ISAAC T. IVASI-IBURN.

Witnesses:

SAML. L. COOPER, .TAMEs S. Frrcn.

